1: The academy just goes to level 1. So there's no possibility to upgrade to level 3.
Umm doc one thing i have to say on that comment, its not entirely true, if he pulled that from a packet world. It would e 3 levels of academy. VS gold coin worlds only have 1 level academy.
I agreed with almost all you said doc, but you have to take into account certain situations. My main village goes as follows,
20 HQ, unless its a direct frontline village, then ill make it 27 as it makes all buildings build fast. It helps when your in the midst of heavy battle
25 Barracks
20 Stable
5 Workshop as its abit quicker build, Now if its specialty village and i want to pump out cats real quick. Ill up it to level 10
Market 15 to 20, depending on the area and how many villages you have
No hiding place
As far as all the other buildings they all should be maxed